Delete the odd one out among the factors affecting enzyme activity.

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Aldolase	$(P)$ Hydrolases
$(2)$ Hexokinase	$(Q)$ Ligases
$(3)$ Succinic dehydrogenase	$(R)$ Lyases
$(4)$ Fructose isomerase	$(S)$ Oxidoreductases
$(5)$ Lactase	$(T)$ Transferases
$(6)$ Acetyl $CoA$ synthetase	$(U)$ Isomerases

Basically how many types of enzymes have been recognised by the International Union of Biochemistry?

What is the role of a competitive inhibitor during enzyme action?

The given graphical representation relates to enzyme activity under three conditions ($pH$,temperature,and substrate concentration). What do the given axes $X$ and $Y$ represent?
$X$-axis $-$ $Y$-axis

Enzymes show the least amount of adaptation for which of the following?